simperium - Move data everywhere it's needed, instantly and automatically
Apache Tomcat - An open source software implementation of the Java Servlet and JavaServer Pages technologies
GUN - Self-hosted Firebase.
JBoss - JBoss is Red Hats Java EE 5-compliant (soon Java EE 6-compliant) application server.
PubNub - PubNub is a real-time messaging system for web and mobile apps that can handle API for all platforms and push messages to any device anywhere in the world in a fraction of a second without having to worry about proxies, firewalls or mobile drop-offs.
Payara Server - Payara Server is a fully supported, developer-friendly, open source application server. Innovative, cloud-native, optimized for production deployments. Jakarta EE & MicroProfile compatible.